| 基于PS-InSAR技术的黄土大厚度挖方区回弹变形规律分析 |
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| 引用本文： | 梁小龙,王建业,白泽朝,齐二恒,李攀.基于PS-InSAR技术的黄土大厚度挖方区回弹变形规律分析[J].测绘通报,2020,0(3):163-166. |
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| 作者姓名： | 梁小龙 王建业 白泽朝 齐二恒 李攀 |
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| 作者单位： | 1. 机械工业勘察设计研究院有限公司, 陕西 西安 710043;2. 北方工业大学信息学院, 北京 100144 |
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| 基金项目： | 延安市成果转化与推广应用专项项目(2018CGZH-11)。 |
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| 摘 要： | 以陕北某湿陷性黄土大厚度挖方地基工程为研究对象，采用PS-InSAR技术对2018-10—2019-11间获取的16景TerraSAR-X卫星影像进行处理，获取了湿陷性黄土挖方区回弹变形信息，总结了大厚度挖方区时序回弹变形特征。结果表明，由于上部土体应力卸载，在开挖区域存在地基土回弹变形现象，选取的高密度PS点变形信息较好地反映了研究区的真实变形情况，回弹变形范围与开挖边界吻合，另外挖方厚度越大，土体开挖引起的回弹变形越大；在开挖完成后的1年监测时间内，回弹区变形量随时间呈线性变化，在最大开挖厚度处，产生最大回弹量为29.3 mm；此外，PS-InSAR技术监测到的变形量与实地水准结果吻合性较好，表明该技术在黄土大厚度挖方区回弹变形监测中具有较好的应用效果。
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| 关 键 词： | 大厚度挖方区回弹变形 PS-InSAR TerraSAR-X 变形规律分析 |
| 收稿时间： | 2019-12-27 |
Research on rebound deformation using PS-InSAR technology in loess plateau area |
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| LIANG Xiaolong,WANG Jianye,BAI Zechao,QI Erheng,LI Pan.Research on rebound deformation using PS-InSAR technology in loess plateau area[J].Bulletin of Surveying and Mapping,2020,0(3):163-166. |
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| Authors: | LIANG Xiaolong WANG Jianye BAI Zechao QI Erheng LI Pan |
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| Institution: | 1. China Jikan Research Institute of Engineering Investigations and Design Co., Ltd., Xi'an 710043, China;2. School of Information Science and Technology, North China University of Technology, Beijing 100144, China |
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| Abstract: | This paper takes a collapsible loess large-thickness excavation foundation project in northern Shanxi as the research object,and uses PS-InSAR technology to process 16 Terra SAR-X satellite images acquired from October 2018 to November 2019.Obtained rebound deformation information for the subsidence area of collapsible loess.The characteristics of time series rebound deformation of large thickness cut-out area are summarized.The results show that due to the stress unloading of the upper soil body,there is a phenomenon of rebound deformation of the foundation soil in the excavation area.The selected high-density PS point deformation information reflects the true deformation of the study area.The rebound deformation range is consistent with the excavation boundary.The greater thickness of the excavation,the more rebound deformation caused by the excavation of the soil.During the monitoring period of 1 year after the excavation is completed,the amount of deformation in the rebound zone changes linearly with time.At the maximum excavation thickness,the maximum rebound amount is 29.3 mm.In addition,the deformation amount monitored by PSIn SAR technology is in good agreement with the field level results,which shows that the technology has a good application effect in the rebound deformation monitoring of large thickness cut areas of loess. |
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| Keywords: | rebound deformation in large thickness cutout area PS-InSAR TerraSAR-X analysis of deformation law |
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